Add noise protocol to libp2p stack

[flcl42]

Protocol implementation request: noise

• Stack: standard libp2p
• Type: channel encryption, transport layer
• Specification: https://github.com/libp2p/specs/blob/master/noise/README.md

Additional context Currently, only the plaintext protocol carries the duties of channel encryption, doing nothing in these terms. Noise should be the first and only(until tls is added) protocol for selection if not in debug mode. Otherwise plaintext can be used.